Propeller.



J. HAYES.

PROPELLER.

APPLICATION FILED SEPT. 26, 1910.

Patented May 30, 1911.

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UNITED sTATEs rATEnTo IcE.

JEREMIAH HAYES, or EVERETT, WASHINGTON, assrenon'or ONE-HALF To JOSEPHHAYES, or SEATTLE; WASHINGTON.

r orEILLER.

Specification of Letters Patent.

Patented May 30, 1911.

Application filed September 26, 1910. Serial No. 588,846.

' subject of. Great Britain, residing at Everett,

. in the county of Snohomish, State of Washington, have invented a newand useful Improvement in Propellers, of which the following is aspecification. My invention relates to an improvement in propellers, andcomprises the novel parts and combinations of parts hereinafterdescribed and claimed.

The object of m invention is to produce a propeller which s all be moreefli'cient than the usual propeller, particularly in the reduction ofthe slip.

In the accompanying drawings I have shown my invention embodied inthe'form whichis now preferred by me.

Figure 1 is a face view of the propeller. Fig. 2 is a side elevation ofthe propeller. Fig. 3 is a longitudinal section of one blade, takenapproximately on the line C, C,.of Fig. 2. Fig. 4 is a transversesection of a blade on the line. B, B, of Fig. 2, looking outwardly.

I make the blades of my improved form of ropeller such that the planesof the wor ing faces are at substantially the same angle from end toend. This angle might .vary in 'diiferent propellers, because ofdifferent conditions and different results desired, but as an averageangle I have adopted and herein show them placed at an angle of with theplane of revolution. The working faces of the blades I makesubstantially flat over most of their extent. Along the front oradvancing edge of the blade surface, I round the face out slightly,

1 making it concave, as is shown at 4 in Fig.

4; the other or following edge I similarly "concave, but to a greaterextent, as is shown at 5 in Fig. 4.

v I prefer that opposite faces of the blades be shaped alike, from whichit follows that the curved edge sections 4 and 5 are at opposite. edgesof the blades on opposite sides thereof. That is, the curved section 4on refer that the blades be slightly inclined.

rom a radial position, this inclination being backward and forward inthe direction in which it is expected to mainly turn. This inclinationis, therefore, in a direction which is about normal to the working face.It is due to this inclination that the blades appear to belaced-slightly unsymmetrical, in Figs. 1 and 2.

I prefer to make the propeller with detachable blades, as shown,although this is not an essential feature of my invention. Fig. 3represents one of the blades detached from the hub 2.

I claim:

1. A propeller having blades in which the workin face is slightly curvedconcavely along t e advancing edge,'and then issubstantially flat tonear the following edge from which point it concavely curves to thefollowing edge in a greater degree than near the advancing edge.

2. A propeller. having blades with faces at the same angle from inner toouter end and with the portions of the faces adjoining the edgesconcaved slightly.

3. A propeller having blades in which the central portion hassubstantially straight faces concaved slightly along the leading edgeand concaved to a greater degree along the following edge. I

4. A propeller having the faces of its blades flat throughout most oftheir width, but with the edge portions slightly concaved, said bladeshaving a substantially constant edge thickness throughout their lengthbut of increasing thickness in its central parts from the outer to theinner end.

' JEREMIAH HAYES.

Witnesses:

SoHUYLEn DURYEE, C. DUDLEY Lian.

